Pipefitter Rigging and Hoisting Operations 5

Question 1

When using a below-the-hook lifting device such as a pipe lifting beam, what document must be available on site during the lift?

Accepted Answer

The manufacturer's load rating chart and instructions

Answer

ASME B30.20 requires that the manufacturer's load rating chart and operating instructions be available for below-the-hook lifting devices.

Question 2

A pipefitter needs to rig a 10,000 lb pipe section using a basket hitch. If the sling angle (from horizontal) is 45 degrees, what is the approximate tension in each sling leg?

Accepted Answer

7,071 lb

Answer

At 45 degrees from horizontal, each leg tension = (load/2) ÷ sin(45°) = 5,000 ÷ 0.707 ≈ 7,071 lb.

Question 3

What is the primary purpose of a swivel hoist ring compared to a standard eyebolt for rigging?

Accepted Answer

It allows 360-degree rotation and angular loading without reducing rated capacity

Answer

Swivel hoist rings rotate 360 degrees and pivot to accommodate angular loading without the capacity derating required for standard eyebolts.

Question 4

During a critical pipe lift, the rigger notices the crane load line is not plumb over the load's center of gravity. What is the correct action?

Accepted Answer

Reposition the crane or adjust rigging until the load line is plumb

Answer

The load line must be plumb over the center of gravity before lifting to prevent uncontrolled swinging or side loading the crane.

Question 5

What is the function of a load moment indicator (LMI) on a mobile crane?

Accepted Answer

It monitors boom angle, radius, and load to warn of approaching the crane's capacity

Answer

An LMI continuously monitors boom angle, radius, and load weight to provide warnings before the crane's rated capacity is exceeded.

Certified Pipefitter Practice Test

Certified Pipefitter Practice Test

Pipefitter Rigging and Hoisting Operations 5